From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page discussing sound amplification theory in a car, with diagrams illustrating a scuttle and a diaphragm speaker.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan081 | |
| Date | 25th March 1931 guessed | |
| (2) In the case of the speaker illustrated the amplification is 7 times the volume of sound of the iron microphone alone. In the case of the car the scuttle will act as a horn amplifier also SCUTTLE ISOLATION FIXING AIR Fig 1. PLEATED PAPER METAL DIAPHRAGM DIAPHRAGM SPEAKER To test this theory one would make two experiments. (i) Lift the body by a crane and suspend a sheet of very thick felt from the rail below the windscreen. This should effect a cure. (2) Then the body is lowered and rigidly mounted to the chassis without the subframe mounting. If the boom returned it would prove that direct transmission between the body and the frame had occurred. The Resonant Medium The frame, column and dash to us are purely transmitting media and are in no way resonant with the vibrations they | ||